BAC_Cont4Stp_01

Functional description

The template determines the resulting switching stages of a multi-level unit, depending on the input signal.
Four switch-on thresholds and a hysteresis can be parameterized.

Interface

BAC_Cont4Stp_01 1:

Diagram 01

Direction of action Cont4Stp_bActn = FALSE = reverse = heating

DspStp	Cont4Stp_udiStp	SwiOn	SwiOff	Cont4Stp_udiRemTiDylOn	Cont4Stp_udiRemTiDylOff	bQ01	bQ02	bQ03	bQ04
0	0	SwiPnt01	SwiPnt01 - Hys	DlyOn	0	FALSE	FALSE	FALSE	FALSE
1	>= 1	SwiPnt02	SwiPnt01 - Hys	DlyOn	DlyOff	TRUE	FALSE	FALSE	FALSE
2	>= 2	SwiPnt03	SwiPnt02 - Hys	DlyOn	DlyOff	TRUE	TRUE	FALSE	FALSE
3	>= 3	SwiPnt04	SwiPnt03 - Hys	DlyOn	DlyOff	TRUE	TRUE	TRUE	FALSE
4	>= 4	SwiPnt04	SwiPnt04 - Hys	0	DlyOff	TRUE	TRUE	TRUE	TRUE

Diagram 02

Direction of action Cont4Stp_bActn =TRUE = direct = cooling

DspStp	Cont4Stp_udiStp	SwiOn	SwiOff	Cont4Stp_udiRemTiDylOn	Cont4Stp_udiRemTiDylOff	bQ01	bQ02	bQ03	bQ04
0	0	SwiPnt01	SwiPnt01 + Hys	DlyOn	0	FALSE	FALSE	FALSE	FALSE
1	>= 1	SwiPnt02	SwiPnt01 +Hys	DlyOn	DlyOff	TRUE	FALSE	FALSE	FALSE
2	>= 2	SwiPnt03	SwiPnt02 + Hys	DlyOn	DlyOff	TRUE	TRUE	FALSE	FALSE
3	>= 3	SwiPnt04	SwiPnt03 + Hys	DlyOn	DlyOff	TRUE	TRUE	TRUE	FALSE
4	4	SwiPnt04	SwiPnt04 + Hys	0	DlyOff	TRUE	TRUE	TRUE	TRUE

Diagram 03

Timing of the switch-on and switch-off delays

At time t1 rX changes from £SwiPnt01 to SwiPnt04

At time t2 rX changes from SwiPnt04 to £SwiPnt01 – Hys

Inputs/outputs

VAR_INPUT

bEn      : BOOL;
rX       : REAL;

bEn: General enable of the function block. If bEn is FALSE, all outputs are set to 0.

rX: Input value, from which the switching state is derived.

VAR_OUTPUT

bQ01       : BOOL;
bQ02       : BOOL;
bQ03       : BOOL;
bQ04       : BOOL;

bQ01: Shows status level 01
TRUE = ON; FALSE = OFF
udiStp >= 1

bQ02: Shows status level 02
TRUE = ON; FALSE = OFF
udiStp >= 2

bQ03: Shows status level 03
TRUE = ON; FALSE = OFF
udiStp >= 3

bQ04: Shows status level 04
TRUE = ON; FALSE = OFF
udiStp >= 4

VAR CONSTANT

PLT_NUM    : BYTE := 1;

PLT_NUM: all alarms and events of all plant components within a controller are included in a global alarm and event list. The assignment of events and alarms to a plant is defined by the assignment of a PLT_NUM plant number.
The recording and processing of an alarm from an aggregate or a device takes place within the templates by means of the alarm function block FB_BA_Alarm.
The evaluation of the alarms of a plant, e.g. for the generation of a collective message or for plant shutdown in case of relevant faults, takes place within the template BAC_PltAlm_01 by means of the function block FB_BA_AlarmPlt.
The evaluation of different plant events within the templates of a plant, takes place within the template BAC_PltComnMsg_01 by means of the function block FB_BA_ComnMsg.

Important! The assignment and evaluation of the alarms and events of a plant can only be done correctly if all templates of a plant have the same plant number!

The plant number can be assigned in the Project Builder in the parameter menu for the templates or via a column in the Excel import.

Program description

Instance	Type	Task
En	FB_BACnetBV1204	General enable of the function block. If bEn is FALSE, all outputs are set to 0
X	FB_BACnetAVSetpoint	Input value, from which the switching state is derived
Hys	FB_BACnetAVSetpoint	Input absolute value hysteresis
DlyOn	FB_BACnetAVSetpoint	Start-up delay of the stages in seconds
DlyOff	FB_BACnetAVSetpoint	Switch-off delay of the stages in seconds
SwiPnt01	FB_BACnetAVSetpoint	Input switch-on point step 01, internally limited to between 0 and 100 in the template
SwiPnt02	FB_BACnetAVSetpoint	Input switch-on point step 02, internally limited to between 0 and 100 in the template
SwiPnt03	FB_BACnetAVSetpoint	Input switch-on point step 03, internally limited to between 0 and 100 in the template
SwiPnt04	FB_BACnetAVSetpoint	Input switch-on point step 04, internally limited to between 0 and 100 in the template
Cont4Stp	FB_BA_Cont4Stp01	The function block Cont4Stp is the core of the step switch template.
DspStp	FB_BACnetMVDisplay	Display active step
SwiOn	FB_BACnetAVDisplay	Display active switch-on point
SwiOff	FB_BACnetAVDisplay	Display active switch-off point
	LIMIT, LIMIT, LIMIT, LIMIT	Limitation of the switch-on points step 1 - 4 to 0 - 100

Versionshistorie

Versionsnummer	Bemerkungen
1.0.1	First release